Networking Protocols Question:
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Why DNS use both TCP and UDP ports. And for which purpose it uses TCP and UDP?

Networking Protocols Interview Question
Networking Protocols Interview Question

Answer:

DNS uses TCP for Zone Transfer over Port: 53
DNS uses UDP for DNS Queries over Port: 53
A client computer will always send a DNS Query using UDP
Protocol over Port 53. If a client computer does not get
response from a DNS Server, it must re-transmit the DNS
Query using the TCP after 3-5 seconds of interval.

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